/* ============================================================
   TETRACON — Enhanced Header + Mega Menu
   Layered on top of existing brand.css / style.css tokens
   ============================================================ */

/* Hide legacy nav-links, we replace with .tt-nav */
header.nav .nav-links { display: none !important; }

.tt-nav-wrap {
  display: flex; align-items: center; gap: var(--space-6);
  flex: 1; justify-content: center;
}
.tt-nav {
  display: flex; align-items: center; gap: 2px;
  list-style: none; margin: 0; padding: 0;
}
.tt-nav > li { position: static; }
.tt-nav > li > a,
.tt-nav > li > button {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 12px 16px;
  font-family: var(--font-body); font-size: 0.95rem; font-weight: 600;
  color: var(--text-primary); background: transparent; border: 0;
  cursor: pointer; text-decoration: none;
  border-radius: var(--radius-sm);
  transition: background var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out);
}
.tt-nav > li > a:hover,
.tt-nav > li > button:hover,
.tt-nav > li.is-open > button,
.tt-nav > li > a.active {
  color: var(--primary);
  background: rgba(0,174,239,0.06);
}
.tt-nav > li > button svg { transition: transform var(--dur-fast) var(--ease-out); }
.tt-nav > li.is-open > button svg { transform: rotate(180deg); }

/* ========= Mega Menu Panel ========= */
.mega {
  position: absolute; left: 0; right: 0; top: 100%;
  background: #fff;
  border-top: 1px solid var(--border-light);
  box-shadow: 0 30px 60px -20px rgba(11,44,82,0.18);
  transform: translateY(-8px); opacity: 0; visibility: hidden; pointer-events: none;
  transition: opacity var(--dur-fast) var(--ease-out), transform var(--dur-fast) var(--ease-out), visibility 0s linear var(--dur-fast);
  z-index: calc(var(--z-nav) - 1);
  max-height: calc(100vh - 130px); overflow-y: auto;
}
.mega.is-open {
  opacity: 1; transform: translateY(0); visibility: visible; pointer-events: auto;
  transition: opacity var(--dur-fast) var(--ease-out), transform var(--dur-fast) var(--ease-out), visibility 0s linear 0s;
}
.mega-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 32px var(--container-pad) 40px;
  display: grid; gap: 32px;
}

/* Products mega layout */
.mega-products .mega-inner {
  grid-template-columns: 3fr 1.4fr;
}
.mega-cats {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 4px 20px;
}
.mega-cat {
  display: flex; gap: 12px; padding: 12px; border-radius: 12px;
  color: inherit; text-decoration: none; transition: background var(--dur-fast) var(--ease-out);
}
.mega-cat:hover { background: var(--bg-alt); }
.mega-cat-icon {
  flex: 0 0 40px; width: 40px; height: 40px; border-radius: 10px;
  background: linear-gradient(135deg, rgba(0,87,184,0.10), rgba(0,174,239,0.14));
  color: var(--primary);
  display: grid; place-items: center;
}
.mega-cat h5 {
  margin: 0; font-family: var(--font-display); font-size: 0.95rem;
  color: var(--text-primary); line-height: 1.25;
}
.mega-cat p { margin: 4px 0 0; font-size: 0.78rem; color: var(--text-secondary); line-height: 1.4; }

.mega-side {
  background: linear-gradient(155deg, var(--navy-900), var(--navy-950));
  color: var(--text-on-dark);
  border-radius: 14px;
  padding: 24px;
  display: flex; flex-direction: column;
}
.mega-side .eyebrow { color: var(--cyan-300); margin-bottom: 10px; }
.mega-side h4 { color: #fff; margin: 0 0 6px; font-size: 1.05rem; }
.mega-side p { color: var(--text-on-dark-dim); font-size: 0.85rem; margin: 0 0 14px; }
.mega-feature {
  display: flex; gap: 12px; align-items: center;
  background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.1);
  border-radius: 10px; padding: 10px; margin-bottom: 10px;
  color: #fff; text-decoration: none;
  transition: background var(--dur-fast) var(--ease-out);
}
.mega-feature:hover { background: rgba(255,255,255,0.10); }
.mega-feature img { width: 44px; height: 44px; object-fit: contain; background: #fff; border-radius: 8px; padding: 4px; flex-shrink: 0; }
.mega-feature strong { display: block; font-size: 0.85rem; font-weight: 600; }
.mega-feature span { display: block; font-size: 0.7rem; color: var(--text-on-dark-dim); margin-top: 2px; }
.mega-side .btn { align-self: flex-start; margin-top: auto; }

/* Manufacturers mega layout */
.mega-mfrs .mega-inner { grid-template-columns: 1fr; }
.mega-mfrs-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px;
}
.mega-mfr {
  display: flex; gap: 12px; align-items: flex-start;
  padding: 14px; border-radius: 12px;
  border: 1px solid var(--border-light);
  background: #fff;
  color: inherit; text-decoration: none;
  transition: border-color var(--dur-fast) var(--ease-out), box-shadow var(--dur-fast) var(--ease-out), transform var(--dur-fast) var(--ease-out);
}
.mega-mfr:hover { border-color: var(--primary); box-shadow: var(--shadow-sm); transform: translateY(-2px); }
.mega-mfr-mark {
  flex-shrink: 0; width: 44px; height: 44px; border-radius: 10px;
  background: #fff; color: var(--primary);
  border: 1px solid var(--border-light);
  display: grid; place-items: center;
  font-family: var(--font-display); font-weight: 700; font-size: 0.85rem; letter-spacing: 0.5px;
  position: relative; overflow: hidden;
}
.mega-mfr h5 { margin: 0; font-size: 0.85rem; color: var(--text-primary); line-height: 1.25; }
.mega-mfr small { display: block; margin-top: 3px; font-size: 0.7rem; color: var(--text-secondary); }
.mega-mfr .count { margin-top: 4px; font-size: 0.7rem; color: var(--primary); font-weight: 600; }
.mega-mfrs-footer {
  display: flex; justify-content: space-between; align-items: center;
  margin-top: 16px; padding-top: 16px; border-top: 1px solid var(--border-light);
}
.mega-mfrs-footer p { margin: 0; font-size: 0.85rem; color: var(--text-secondary); }

/* Responsive */
@media (max-width: 1024px) {
  .tt-nav-wrap { display: none; }
  .mega { display: none; }
}

/* Header search icon */
.tt-search-btn {
  display: inline-grid; place-items: center;
  width: 40px; height: 40px; border-radius: 999px;
  background: var(--bg-alt); color: var(--text-primary);
  border: 1px solid var(--border-light);
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease-out);
}
.tt-search-btn:hover { background: var(--gray-200); }

/* Search overlay */
.tt-search-overlay {
  position: fixed; inset: 0; z-index: var(--z-modal);
  background: rgba(11,44,82,0.6);
  display: flex; align-items: flex-start; justify-content: center;
  padding: 12vh 20px 20px;
  opacity: 0; visibility: hidden;
  transition: opacity var(--dur-fast), visibility 0s linear var(--dur-fast);
}
.tt-search-overlay.is-open { opacity: 1; visibility: visible; transition-delay: 0s; }
.tt-search-panel {
  background: #fff; border-radius: 16px;
  width: 100%; max-width: 640px;
  padding: 20px; box-shadow: var(--shadow-lg);
}
.tt-search-panel input {
  width: 100%; font-size: 1.15rem; padding: 14px 16px;
  border: 1px solid var(--border-light); border-radius: 10px; font-family: var(--font-body);
  outline: none;
}
.tt-search-panel input:focus { border-color: var(--primary); box-shadow: 0 0 0 4px rgba(51,121,198,0.15); }
.tt-search-results { margin-top: 12px; max-height: 50vh; overflow-y: auto; }
.tt-search-result {
  display: flex; gap: 12px; padding: 10px; border-radius: 8px;
  color: inherit; text-decoration: none;
}
.tt-search-result:hover { background: var(--bg-alt); }
.tt-search-result img { width: 48px; height: 48px; object-fit: contain; background: var(--bg-alt); border-radius: 8px; padding: 4px; }
.tt-search-result strong { display: block; font-size: 0.9rem; color: var(--text-primary); }
.tt-search-result span { display: block; font-size: 0.75rem; color: var(--text-secondary); margin-top: 2px; }
.tt-search-empty { padding: 16px; color: var(--text-secondary); font-size: 0.9rem; text-align: center; }